A woman smashed up 18 cars in a jealous rage after she suspected her husband of having an affair.

Mrs Tu, 34, used a sledgehammer to wreck the cars, including her 37-year-old husband Robin's four-month-old BMW 318, in a lunchtime rampage in Singapore.

According to the Straits Times all the other vehicles belonged to Carz Zone Automobile, the second-hand car business she owns with her husband.

Onlookers said Mrs Tu shattered the windows and windscreens of a number of expensive cars, including Mercedes-Benzes, BMWs and Volvos.

Witnesses say she also attacked a computer and telephone in the office.

Police said the act has been classified as "mischief to vehicles", an offence that is not serious enough to require arrest. But they are looking into whether there was intimidation.

"I hit first, then ask later," Mrs Tu told The Straits Times.

She said she suspected her husband of 16 years had been having an affair with a 35-year-old former MediaCorp actress, though she hasn't confronted him about it.

Mrs Tu, who said she plans to get a divorce, told the paper she has no regrets about what she did.

"Let my husband be destroyed, I don't care. It is my shop, my cars, I can do what I like to them," she said.